Absence of ferromagnetism in MnBi2Te4/Bi2Te3 down to 6 K

We successfully fabricated a MnBi2Te4/Bi2Te3 heterostructure by incorporating Mn and Te inside the topmost quintuple layer of Bi2Te3, as unambiguously confirmed by low-energy electron diffraction I−V and scanning transmission electron microscopy measurements. The surface-state Dirac cone of the hete...

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Bibliographic Details
Published in:Physical review. B 2021-05, Vol.103 (20)
Main Authors: Fukasawa, T, Kusaka, S, Sumida, K, Hashizume, M, Ichinokura, S, Takeda, Y, Ideta, S, Tanaka, K, Shimizu, R, Hitosugi, T, Hirahara, T
Format: Article
Language:English
Subjects:
Bismuth tellurides
Dichroism
Electrons
Ferromagnetism
Heterostructures
Low energy electron diffraction
Magnetic properties
Magnets
Scanning transmission electron microscopy
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Summary:We successfully fabricated a MnBi2Te4/Bi2Te3 heterostructure by incorporating Mn and Te inside the topmost quintuple layer of Bi2Te3, as unambiguously confirmed by low-energy electron diffraction I−V and scanning transmission electron microscopy measurements. The surface-state Dirac cone of the heterostructure showed little change compared to that of pristine Bi2Te3, and x-ray magnetic circular dichroism measurements showed that the system was paramagnetic down to 5.6 K. These results are in contrast to previous works on related materials that showed magnetic order around 10 K as well as theoretical predictions and suggest the intricacy of the magnetic properties of two-dimensional van der Waals magnets.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.103.205405